Polishing machine



JUL 16 1940 D. E. MuLHoLLAND rousanm means Filed Nevjz, 1936 5Sheets-Sheet 1 Y am' mw/am Jn. 16, 1940. n. E. MULHOLLAND PDLISHINGMACHINE Filed Nov. 2. 1936 5 Sheets-Sheet 2 Jan. 16, 1940. lz.4 E.4M-uLi-IOLLAIM'J POLISHING MACHINE 5 Sheets-Sheet 3 Filed Nov. 2. 1936 3rwa/wbvb @Mingo/fand Jan. 1161,41940. D. E. MULHOLLAND POLISHING MACHINEFiled Nov. 2, 193e' 5 Sheets-Sheet 4 Jan. c16, 1940. D. E. MuLHoLLANDPOLISHING MACHINE Filed Nov. 2. 1936 .aa'd E: @Zio/fand Patented Jan. l@l entre"- sjrarss maaier Parser euries 44 Claims.

My invention relates to machines for polishm ing metal surfaces.. moreparticularly the surfaces of sheets of stainless steel and the like, forremoving the open surface andi other defects usually present in metalsheets to produce what is customarily called a fundamental surface conidition.

One of the principal objects of the invention is to provide extremelysensitive means for accurately controlling the pressure between thepolishing roll or wheel and the-metal sheet.

Another object ofthe invention is to provide means for producing thedesired pressure between the work and the polishing roll which willreadily accommodate itself to variations in' thickness of a metal sheetbut yet will resist. suelo.J

sudden. or abrupt movements 'as' would produce sudden changes inpressure on the sheetfthereby avoiding any change in the character ofcut being made by the polishing roll which would result in marring thefinish of the surface.

Another object of the invention is to control the rate of travel of thework past the polishing roll by the pressure producing means.

A further object of the invention is to provide improved means forsupplying a coolantA to the metal sheet, so that the heat generatedtherein Y by the polishing roll will be rapidly dissipated and thusenable a greater amount of stools to be removed per pass than hasheretofore been possible due to warping anti burning: of the sheetcaused by the failure of the generated heat of abrasion to escape.

A primary feature of the invention consists in providingl the polishingmachine with a pivoted' carriage upon which is mounted o. rotatable worksupporting roll, the carriage being movm vabvle about its pivot to causethe work support ing? roll to move toward the polishing roll of themachine. l

Another feature of the invention consists in4 providing' the pivotedcarriage with means for counterbslancing: the work supporting roll., sothat the carriage itself will be in a state of equilibrium. i l

Another feature of the invention'consists in providing the machine withuuid pressure means for inducing pivotal movement of the carriage tomove the work supportingn roll toward the polishing roll, the fluidpressure means," through the worlz supporting roll, serving to maintainthe work in yielding engagement with the polm ishing roll,

A further feature of .the invention consists in providing an adjustable`stop limitins movement vworlr supporting roll away. from the ofthe worksupporting roll towarthe polishing roll .so as to` prevent the rollsfrom contacting each other. v

Still another feature ci the invention consists in providing mechanismfor rotating the work o supporting roll at a lpredetermined speed, the

mechanism including means preventing rotation of the supporting roll ata speed substantially in excess of the predetermined speed whereby thesupporting roll will control the rate of movement lo of the work pastthe polishing roll. f

A still further feature of the invention consists in providing thecarriage adjacent the work supporting roll with slrids for supportingthe work, which are preferably vertically and angu- 15 larly adjustablewith respect to the carriage.

A still further feature of the invention consists in providing means forsupplying a coolant. under pressure to a portion of the work immediatelyadjacent the portion thereof in contact .2li with the polishing roll,the means discharging the coolant onto the work toward the polishingroll at-an oblique angle to the direction of travel of the work. l

Other and more speciilc features of the inven- 25 tion, residing inadvantageous forms, combina.- tions and relations of parts. willhereinafter l appear and he pointed out in the claims.

In the drawings:

Figure l is a side elevation of machine. A

Figure 2 is a plan view of the machine. l

Figure 3 is a vertical sectional view taken on line @-3 of Fleurs 2. A h

Figure 4 is a vertical sectional view taken on 35 `line l-ii of l.

Figure 5 is a verticalsectional View line {iw-il of Maure l.

Figure o is a plan view of the coolantsupplying means.

Figure 'l is a side elevational view off one of the coolant supplying.means and the mechanism for adjusting it vertically.

Figure u is a detail view of the combined means for renderinginoperative the iluid pressure means 4 which rotates the carriage inonedirectiori for moving the work supportingn roll toward the pol-l the4polishing# 3@ taken on I isiiing roll and for simultaneously rockingthe x carriage in the opposite direction to move they polishing roll.

Figure 9 is an enlarged detail sectional view taken on a linecorresponding to line 9 9 of Figure 1, illustrating the means forvertically 55 ad angularly adjusting the work supporting s ds.

Figure 10 is a detail side elevational view illustrating the mechanismfor operating the means for actuating the movable stop which limitsmovement of the work supporting roll toward the polishing roll.`

I Figure 11 is an enlarged detail sectional view on line` II-II ofFigure 3. i

Figure 12 isa detail sectional 'view taken on line I2--I2 of Figure 11.Y

Referring more particularly to the drawings, I the polishing machinecomprises generally a work feeding table or section Ill, a work deliverytable or section I I and a polishing unit or section I2 which isinterposed between the feeding and delivery tables.

The polishing unit has a main frame I3 which is preferably formed as aunitary casting and includes side walls I4 connected by a base I5 whichforms the bottom wall of .a coolant collecting chamber I6. The bottomwall I5 is spaced below ilanges or the like I1 projecting outwardly fromthe lower portions of the side walls I4 and resting upor the floor orother suitable support provided for the polishing unit. The side wallsI4 are provided with upwardly projecting portions I9 aiording supportsfor bearings 20 ot the polishing roll 2l. 'I'he bearings, as well astheir journals, are oaf exceedingly sturdy construction so as to providein conjunction with the frame Il a very rigidV support for the polishingroll preventing it from vibrating or chattering.

The polishing roll is .preferably of the charace ter illustrated `anddescribed in my Patent No. 2,106,186, andit may comprise abrasive grainof very small size, such as No. 240 or other sizes depending upon thecharacter` of nish desired, bonded in a suitable organic material andmade in the form of a sleeve to iit over a drum 22 mounted on an -axle23. The axle projects beyond one ofits bearings 20 and is .providedwitha pulley 24 having a plurality of peripheral yshaped grooves forcooperating with a drive belt 25 formed with a plurality of V-shapedportions on its inner surface-the belt being driven by -an electricmotor 26 or other suitable means.

Pivotally mounted on the` frame I3 of the 'polishing unit adjacent oneend thereof is a rigid carriage or the like ,21 having side members 2,8which may advantageously be formed of cast metal.v Intermediate theirends, the side members are respectively formed with outwardly projectinghollow trunnions 29 which are* mounted in bearings 30 on the main frameIiy and thus aord apivotal support for the carriage.

Mounted on the carriage so as to be positioned beneath the polishingrollJ2I is, the rotatable work supporting roll Il consisting of a drum32 having an outer rubber covering 3l' and a shaft 34,'each end of whichis provided with/a pair of spaced bearing collars 36 and 36 which arejournaled'lin the side members 26 of the carriage. Extendinglongitudinally of the carriage beneath the side members thereof forimparting rotation to the work supporting roll are shafts 31, each ofwhich is provided 'at one end with a worm 38 and at its opposite endwith a worm 'wheel 39. The worms 38 are disposed within housings 46formed in the side members 28 of the carriage and they cooperate withworm wheeis 4 Iewhich are mounted -on shaft 34 between the bearingcollars i6 and 36. Worm wheels 39 on shafts 31 are disposed A Withinhousings 42 in the side members 26 and they cooperate with worms 4lformed onta shaft 44 which is coincident with the pivotal axis of `thecarriage and is journaled within the hollow pivotal axis of thecarriage, it will be readily perceived that the work supporting orback-up roll 10 may be r tated in all pbsitionsof adjustment thecarriageK may assume and that the mechanism for rotating it oersnoresistance whetever to pivotal movement of the carriage. Moreover, asthe roll is rotated through the intermedlacy of 15 Worm gears, it cannotbe over-driven by the work, due to its, engagement with the more rapidlyrotating polishing wheel, and 'accordingly the supporting roll serves tocontrol the passage of the work past the polishing roll.

As the tendency of the polishing roll is to advance the travel ofthesheet and the work supporting Aroll acts as a brake controlling thework travel, itis desirable to prevent any back-lash in the drivingmechanism of the supporting roll 25 because, if there is lost motion inthe mecha-A nism, the sheet, when it first enters between the rolls,will momentarily pause in its travel and its surface will be marked. Toprevent this, shaft 44 is made in two sections which are adapted 30 tobe rigidly connected by a coupling having flanges 44' for receivingsecuring bolts. The openings in one of the flanges are in` the form ofarcuate slots so that before the bolts are tightened to rigidly connectthe anges, the sections 35 of shaft 44 may be rotated in oppositedirections until all lost motion in the train of parts is taken up.

To maintain the carriage in a condition of I equilibrium', it isprovided -with an adjustable 4I) counterweight 48. While any suitablemeans kmay be employed for adjusting the counterweight ^to effectperfect balance of the carriage, this may be advantageously accomplishedby mounting the counterweight on a rotatable screw/threaded shaft 49winch is supported atl its opposite ends by brackets 66 projectingdownwardly from the carriage. At one end, shaft 49 is provided with abevel gear 5I which meshes with a similar gear 82 formed on .one end ofa shaft 53 which is also 50 Supporting roll constitutes, vin effect, afloating e0 member which may be ,delicately controlled for producing theprecise pressure required between the polishing roll and the work toobtain optimum results. f

To induce pivotal movement of the carriage causing the work supportingroll to move toward the polishing roll and to yieldingly maintain thework in engagement with the latter .under the desired pressure, twofluid containing chambers 66 are provided. l These chambers arerespective- 70' ly positioned below Vthe bearingsof the work supportingroll and elch consists of'a cup-'shaped base portion 56 .and a tubularguide portion 51 within which is disposed a rubber diaphragm 669,187,462 tween the base and guidepomions. Resting upon the diaphragme58 are cylindrical bosses or the like t@ which are secured to and dependfrom the side members of the carriage adjacent the housings M for theworm gears -I oi the work supporting roll.

'Ihechambers 55 are connected to a fluid pressure reservoir (air beingthe iluid preferably used) having a capacity many times that ofbothchambers by means of conduits 6b which branch from a common conduitti provided with amanually controlled valve 62. Byemploying iiuidpressure for maintaining e work in engagement with the polishingroil, iwill be appreciated that the pressure exerted by the supporting roll maybe accurately controlled. Moreover, as the work supporting roll islyieldingly maintained in engagement with the work bythe fluid pressure,it will readily accommodate itself to changes of thickness in the workand it will exert a constant and uniform pressure yin all positions itmay assume dueto 'variations in thickness oi'v .the

.Furthermore while the carriage is mounted so as to be extremelysensitive to the changes in thickness of the work, it has sufdcient massso that it will resist such sudden or abrupt movements as would producesudden changes in the pressure exerted by the supporting roll,whichwould result in changing the character. ofl cut being made by thepolishing roll` and thus mar the finish of the surface. I

As it is desirable to set the polishing and work supporting rolls inmotion before the work is led to the machine, means is employed forpreventing the rolls from coming in contact with each other.v This meansmay comprise horizontally adjustable stop members 83 which are slidablymounted upon T-headed projections 64 extending inwardly from the sidewalls Il of the frame adjacent the portion of the carriage upon whichthe work supporting roll is mounted. The inner end s of the members 83are inclined upwardly and they are adapted to cooperate with ledges orshoulders 05 which project outwardly from the side members' of thecarriage and have inclined upper faces disposed in planes parallel withthe inclined forward ends of members 83. Thus )it will be seen thatmovement of the carriage in a direction causing the work supporting rollto move toward the polishing roll will be arrested by the shoulders 65of the carriage engaging the stop members 63 and that, by shifting thelatter horizontally, the gap between the polishingv and supporting rollsmay be easily controlled.A

It has been found preferable to set the stop members so that the gapbetween the two rolls will be approximately .010 inch less than thethicknesslof the sheet to be polished. i As the sheet enters between therolls, the supporting roll will, therefore, move downwardly .010 inchand thus be free to act -as a iloating support. The stops may beadjusted by any suitable means, such, for example, by a rack and pinionmechanism which includes. a shaft 66 on which are mounted two pinions B1for cooperating with teeth 88 formed on the upper surfaces of the stops.Shaft 66 is supported by bracket 69 and'lll which may be convenientlyformed integral with the mainframe I3 of the machine and at one end itis provided with a gear wheel 1| cooperating with a larger gear wheel 12mounted on a stub shaft "i3, which is also preferably journaled :in thebracket lil. Shaft 'i3 is .provided 'with a hand wheel ld whereby it maybe easily rotated to effect rotation of shait 56 and it is also providedwith a calibrated dial "l5 for indicating,

with reference to a pointer 'lf3 also secured to brackets lil, 'thespace between the polishing and work supporting rolls.

As it is sometimes desirable to move'the work supporting roll away fromthe polishingamL suitable mechanism is provided for rendering the 'duidpressure means inoperative and for simultaneously vpivoting the carriagein a ydirection for causing downward movement of the work snpportingroll. l'his mechanism may advantageously consist oi an electric thrustorli hailing a plunger 'itl movably connectedto the outer end of a lever79 which is pivotally mounted intermediate its ends on a suitablylocated bracket L50.

The inner end of lever 'i8 projects beneath the i outer end of necarriage and itis adapted to engage any suitable portion thereof, suchas one of the brackets 50, being guided in its movement between spacedlugs B2 formed integral with `the latter, so that. when the lever isrotated ina clockwise direction by downward movement'o'f the plunger 18of the thrustor, the outer' end of the carriage will swing up and thusresult in imoving the iwork supporting roll downwardly away from thepolishing roll.

For cutting olf the supply of fluid pressure to the chambers 55 and foralso relieving whatever pressure may be in the chambers at the time thethrustor is actuated to move the work supporting roll away from thepolishing roll, a valve device 83 isdisposed in the main conduit fl.This device has a slide valve 84 which is mow/'ably connected to thellever 19 so that, when the plunger of the thrustor is operated, theslide valve will move downwardly to shut oil the supply of uid and ventthe chambers 55 to 'the atmosphere through a port 85 formed in the bodyof the valve. When the thrustor is in its normal inoperativepositionhowever, the slide valve is disposed inv a position enabling the freeflow of iluid tothe chambers, provided, of course, the manually operablevalve 62 is open. 'n

For bridging the spaces between the work supporting roll and the feedingand deliverytables, a skid 86 is mounted on the carriage closelyadjacent the feeding side of the roll and a similar skid 81 is mountedon the carriage closely adjacent the delivery side of the roll. Eachskid comprises a plurality of arms 88 suitably mounted in spacedrelation on a supporting bar 39 which is provided adjacent each end witha pair of downwardlyextending spaced lugs Si! for receivingd '94, itwill be perceived that the skids may be easily adjusted vertically and,by untightening the bolts 93, they may be adjusted angularly. Thussimple and eicient means is provided whereby the skids may be quicklyadjusted so as to properly guide the work from the feeding table to thepolishing roll and from the polishing roll to the delivery table.

The'

Mounted upon the main frame of the polishing unit on opposite sides ofthe polishing roll are chambers 91 for supplying coolant to portions ofthe work immediately adjacent the portion thereof in contact with thepolishing roll. Each of the coolant supplying chambers, which may beadvantageously formed of cast metal, progressively decreases in heighttoward Aits discharge end, so that the latter may be disposed near thepoint of contact between the work and the polishing roll and thus causethe coolant to diss charge directly onto portions of the workimmediately adjacent. the 'portion in contact with thepolishing roll.lIn the rear of each chamber 01 is formed a compartment 98 having aremovable back plate 99 provided with means |00 through which coolant issupplied to the compartment. Communicating with the compartment 08 andextending forwardly therefrom are a plurality of ducts the dischargeends of ywhich are disposed as indicated at |02 so as to cause thecoolant to issue therefrom at an oblique angle tothe direction of travelof the work. By causing the coolant to discharge onto the work in thismanner under apressure preferably in excess of 250 pounds per squareinch, the coolant will ilow transversely of the work at a velocity whichwill effect such emclent results' that the polishing wheel may remove agreater amount sidered possible.

nach of tneeooisnt Supplying chambers is' be conveniently jurnaled inbrackets |00 rigid with the side walls of the frame I4 and at one end itextends through the adjacent side wall of the'fram'e where it isprovided with a hand wheel |00. The polishing wheel is preferablyenclosed by a sheet metal hood ||0 within which is mounted means for.freeing the periphery of the polishi g roll of particles of grit andother waste material which may adhere thereto. This means serves toforcibly project a fluid medium lat an exc l ly high pressure againstthe entire surface ,of the roll at least once in each revolution from aseries fof nozzles mounted in a header ||2 which is connected tosuitable means, not shown, for supplying iiuid under pressure.

- The discharge ends of the nozzles are disposed closely adjacent theperiphery of the pol- .hhing roll, so that the fluid issuing therefromlwill. upon each revolution ofthe roll,. readily dislodge Particles ofgrit and other matter adhering to its surface before the adhering matteri becomes impacted by repeated contacts with the work and gathersadditional matter which would result in an adhering aggregate beingbuilt up on the surface of the roll. j; In addition' to the fluidpressure means for vipaning the surface of the polishing roll, a plu-'ility. of deiiecting bellies ||3 are mounted within hood ill whichserve to deflect and conduct .olthalidesoftherollthecoolantandcieanofstock per pass than has heretofore been con- A.

of the chamber.. The horizontal shaft |04 may ing fluid whichdischarges. tangentially from the roll and4 is ladened with abrasivewastes and thereby prevent this adulterated fluid, by being deflectedfrom the hood, from entering the stream of ltered coolant emergingfromthe nozzles on the entry side of theroll. Each of the deflectedbames ||3 is formed with a main body portion of arcuate shape, one endof which is attached to the inside of the hood and the opposite or freeend of which is provided with a. strip of rubber III for engaging thesurface of the roll.

While the work feeding table may be of any suitable construction, it ispreferably provided withv a plurality of rollers ||5 which are driventhrough a train of gears H6. The axes of the rollers Il! are preferably4inclined with respect to the axes of the polishing and work supportingrolls so asto maintain the work against the guide bar with which thetable is provided and thus insure' the work being fed in the properposition to the polishing roll. e

The delivery. table is also provided with a plurality of rollers ||0 butthese rollers need not 1 be positively driven. Interposed between thefor-'- ward end of the deliveryA table and the rear end of the skid 01are a plurality of rollers ||9 for conducting the work from the skid tothe delivery table. These rollers are mounted in sup--l whereby theyymay be vertically adjusted so that they may, at all times, be disposedat substantially the same elevation as the skids 06 and 81 which areadjustable to take care of the work level as wear occurs on the grindingdrum and the work supporting roll. The means for vertically adjustingtheA elevation of the rear end of the feeding table and the front end ofthe delivery table may, if desired, consist of floor engaging pads orthe like |22- having screw threaded portions |23 which extend upwardlyinto the vertical supports |24 of the tables and aresprovided with nuts|25 engaging the lower ends of the vertical supports. The feeding tableis of such height at its front end that it will be several inches abovethe `highest point to which it is ever necessary to elevate the rear endand the rear end of the delivery table is likewise several inches higherthan the front end thereof so that the coolant, as git spreads upon thework, will always tend to flow toward the center of the vmachine whereit may be collected in the cham- From the foregoing, it will beperceived that? I have devised a rugged polishing machine havingextremely sensitive means which may be ac curately controlled tomaintain the work against the polishingl roll under the precise pressuredesired. Furthermore, by reason of the means employed for supplyingcoolant to portions of gree is obtained.

The operation of applicants device is as fol lows: The sheet to bepolished is placed upon thedriven-rolls illan'dduetotheangulari'glaisance tated at high speed inthe direction of the arrows,

shown on Figures 1 and 3 tends to force the sheetA at a. high rate of'speed toward the rolls lib.. This action is prevented owing to the fact'that the work supporting roll is positively driven at a definite rateof speed and therefore limits the speed of passage of the plate. Thesupporting roll, owing to its pivotal support andto the diaphragm, iscapable of une adjustment m that i lthe pressure of the plate againstthe poiis'hing roll may be regulated so as to limit the amountv ofmaterial removed from the surface of the plate. The adjustment of theskid table permits the skid table to be moved to compensate for thediil'erence :ln/diameter oi the 'polishing roll due to wear of 'itsabrasive surface'.v The stop mechanism illustrated in detail in Figures10, 11 and 12 provides for anqexceedingly accurate gage of the pressurewhich will be applied by the work supporting roll and at the same timeprevents the work supporting roll from contacting with the polishing orabrasive the passage of one plate and the nex Various modications andchanges in details of construction of the speciiic embodiment of theinvention described and illustrated/herein may, of course, be madewithout departing from the spirit of the invention as denedrby theappended claims. v l l What I claim is: f

1. A machine for polishing metal sheets and the like, including arotatable polishing roll, means for driving the polishing roll, a worksupporting roll disposed beneath the polishing roll and movable withrespect thereto in a substantially vertical direction, and mechanism-ior rotating the work supporting roll at a predetermined speed, saidmechanism including means preventing the rotation of the supporting rollat a speed submantlally in excess of said predetermined speed wherebysaid supporting roll controls the movement of the work past thepolishing roll.

2. A machine for polishing sheets and the like, including a polishingroll, means :for rotating the polishing rolLIo/vertically adjustablework supporting roll beneath the polishing roll, iluid pressure meansfor moving the work supporting roll upwardly to force the work intoengagement ,with the polishing roll, andfmechanism for rotating saidwork supporting roll at a speed less than the speed of the polishing rll, said mechanism including means for ma taining `the speed of rotationof the supporting roll less 'than the speed of rotation of the polishingroll.

3. A machine forpolishing metal sheets and the like, including arotatable polishing roll having a substantially unyielding surface,means for driving the polishing roll, a work supporting roll.

having a yielding surface disposed neath the polishing roll and movablewith respect thereto in a substantially vertical direction, andmechanism for rotating the work supporting roll at -a predeterminedspeed which is less than the speed of the polishing roll, said mechanismincluding means preventing rotation oi the suprollv between porting rollat a speed substantially in excess of, said predetermined speed wherebysaid supporting roll controls the movement of the work past thepolishing roll.

4. Aimachine for polishing metal sheets and the like, including apolishing roll, a vertically movable work supporting roll disposedbeneath the polishing roll, fluid pressure means providing a yieldingsupport for the work supporting roll and for moving it toward thepolishing roll, and mechanism for rotating said supporting roll in- Icluding meansnmovable with 'the latter whereby said mechanism isoperative to drive said supporting roll in all positions it may assume.

5. ,A machine gior polishing metal sheets ,and the like, including apolishing roll, a work supporting roll, means for -rotating the worksupporting roll, .iluid pressure means for moving the Work supportingroll toward the polishing roll, and an adjustable stop for limiting theextent of movement of-said work supporting lroll toward -the polishingroll.

6. A machine for polishing metal sheets and the like, including apolishing roll, a work supporting roll movable toward the polishingroll, nuid pressure means for yieldingly-maintaining the supporting rollin contact with the work, and adjustable means limiting movement of thesupporting roll toward the polishing roll whereby the supportingl rollmay be initially set so as to provide a predetermined gap between it andthe polishing roll.

7. A machine for polishing metal sheets and the like, including apolishing roll, a pivotally mounted carriage, a rotatable Worksupporting roll mounted on the carriage and disposed beneath thepolishing roll, the axis of the supporting roll and the pivotal axis ofthe carriage being laterally spaced and being disposed in substantiallythe same horizontal plane, and means cooperable with the carriageadjacent the supporting ln'oll to cause said carriage to pivot andthereby move'the supporting roll relatively to the polishing roll. i

8.,"A machine :for polishing sheets and the like, including a polishingroll, a pivoted carriage,`a rotatable work supporting roll disposedbeneath the polishing roll and mounted on said carriage, said worksupporting rollfbeing spaced horizontally from the pivotal axis o1' thecarriage, and yieldable means cooperable with the carriage at a pointspaced from the pivotal anis thereof for causing the supporting roll tomaintain the work in contact with 'the polishing roll.

9. A machine iorfpolishing metal sheets and the like, including apolishing roll, a pivoted carriage, a Ywork supporting roll disposedbeneath the polishing roll and mounted on said carriage, :duid pressuremeans :lor causing said carriage to move the work supporting roll towardthe polishing roll, said huid pressure means serving to maintain thework with the' polishing roll.

10. A machine for polishing metal sheets and the like, including apolishing roll, a pivoted carriage, a work supporting roll disposedbeheath the polishing roll and :mounted on said carriage on one side ofthe pivotal axis thereof, means inducing pivotal movement of thecarriage for causing the work supporting roll to move toward thepolishing roll, and means on said carriage for counterbalancing the worksupporting ro l.

l1. A machine for polishing metal sheets and in yielding engagement thelike, including a polishing roll, a pivotally mounted carriage, a worksupporting roll dis-l posed beneath the polishing roll and mounted onsaid carriage, means on said carriage counterbalancing said worksupporting roll, means for pivoting said carriage to move the worksupporti-ng roll ,toward the polishing roll, and adjustable means forlimiting movement of said carriage in a direction causing. the worksupporting roll to move toward the polishing roll, said adjustable meansserving to prevent the supporting roll from contacting the polishingroll.

12. A machine for polishing metal sheets and the like, includingir-polishing roll, a carriage pivlotally mountedi intermediate its ends,a work supporting roll mounted on the carriage on one side of itspivotal axis, means on the carriage on the other side of its pivotalaxis for counterbalancing the work supporting roll, and iluid pressuremeans for inducing pivotal movement of the carriage to move the worksupporting roll toward the polishing roll.\ n V 13. A machine forpolishing metal sheets and the like, including a polishing roll, acarriage pivotally mounted intermediate its ends, al work supportingroll mounted onvthe carriage on one side of its pivotal axis and movabletoward the polishing roll upon pivotal movement of the carriage in onedirection, means mounted on the carriage for counterbalancing the worksupporting roll, and yieldable means cooperable with the carriageforresisting movement thereof in a direction causing the supporting rollto move away from the polishing roll.

'14. A machine for polishing metal sheets and the like, including apolishing roll, a carriage pivotally mounted intermediate its ends, awork supporting roll mounted on the carriage on one side of its pivotalaxis. and adjustable means mounted on the carriage on the other side ofits pivotal axis for counterbalancing the work supporting means, andmeans for inducing pivotal 'movement of the carriage to cause the worksupporting roll to, move toward the polishing roll.

l5. AA machine for polishing metal sheets and the like, including 'apolishing roll, a pivoted carriage, a work supporting roll mounted onthe carriage in spaced relation to the pivotal axis thereof, andmechanism for inducing pivotal movement of the carriage to move the worksupporting roll toward the polishing roll, said mech-'- anism includinga flexible diaphragm, a member mounted on the Vcarrlage'engageable withthe diaphragm, and iiuid pressure means for actuating said diaphragm.

. 16. A machine for polishing metal sheets and the like, including apolishing roll, a pivoted carriage, a rotatable work supporting rollmounted on the carriage in spaced relation to the pivotal axis thereof,means for inducing pivotal mo'vement of the carriage to move the worksupporting roll toward the polishing roll, and mechanism for rotatingthe work supporting roll including a rotatable shaft having its axiscoincident with the pivotal axis of the carriage.

17. A machine for polishing metal sheets and the like including apolishing roll, a pivoted carriage, a rotatable work supporting rollmounted on the carriage in spaced relation to the pi'votal axis thereof,means for inducing pivotal movement of the carriage to move the worksupporting roll toward the polishing roll, and mechanism for rotatingthe work supporting roll including a main drive shaft having its-axiscoincident with the pivotal axis of the carriage and means carried bythe carriage operatively ctnaumen opposite direction.

necting said drive shaft and for imparting rotation to the latter. s

18. A machine for polishing metal sheets and the like, including apolishing roll, a pivoted carriage, a work supporting roll mounted onthe carriage in spaced relation to the pivotal axis thereof, skidsmounted on the carriage adjacent the supporting roll for supporting thework, means for inducing-pivotal movement 'of the carriage fr moving thesupportingroll and skids toward the polishing roll.

19. A machine for polishing metal sheets and the like, including apolishing roll, a pivoted carriage, a-.work supporting roll mounted onthe carriage in spaced relation to the pivotal axis thereof, skidscarried by said carriage and disposed on opposite sides of thesupporting roll for supporting the work, and meansvfor inducing pivotal`movement of the carriageto move the supporting roll and skids toward thepolishing roll. n I K 2&5. A machine for polishing metal sheets and thelike, including a polishing roll, a pivoted carriage, a work supportingroll mounted on the carriage in spaced relation to the pivotal axisthereof, skids mounted on the, carriage adjacent thesupporting roll forsupporting the work, means for inducing pivotal movement ofthe carworksupporting roll riage i'or moving the supporting roll and skids towardthe polishing roll, and means for vertical- 1y adjusting said skids withreference to said carriage.

21. A machine for polishing metal sheets and the like, including avpolishing roll, a pivoted carriage, a work supporting roll, mounted onthe carriage in spaced relation to the pivotal axis thereof,'.skidscan'ied by said carriage and disposed on opposite sides of thesupporting roll for supporting the work, means for inducing pivotalmovement of the to move the supporting roll and skids toward thepolishing roll, and means for vertically and angularly adjusting saidskids with reference to the carriage.

22. A machine for polishing metal sheets and the like, vincluding apolishing roll, a pivoted carriage, a work supporting roll mounted onthe carriage, iluid pressure means'for inducing pivotal movement of thecarriage to move the supporting roll toward the polishing roll, andmeans for pivoting the carriage to cause the supporting roll to moveaway from the polishing roll.

23. A machinei'or polishing metal sheets and the like, including apolishing roll, a pivoted car-v riage. a work supporting roll mounted onthe carriage, fluid pressure means for inducing pivotal movement of thecarriage to move lthe supportingv ing through the axis oi'. thepolishing roll for supplylng a coolant under pressure to the portions ofthe work immediately adjacent theportion thereof in contact with thepolishing roll,v one o! said coolant supplying means causing the'coolant discharging therefrom to iiow parallel to the axis i of saidroll in one direction and the other of said gieans causing the coolantdischarging from it to owparalleltotheaxisoftherolllmtinthehter-balancing means on the work support on the other 'side of said pivotmeans to neutralize gravitational eiiect on the work-engaging means, adiaphragm, a boss attached to said work supvport resting on saiddiaphragmand vout of {rictional sliding contact with other parts,controlled pressure means for moving said diaphragm to urge the workthrough the work-engaging means toward said polishing wheel, and meansto limit the movement of the work-engaging means to prevent itscontacting the polishing wheel.

36I In a machine or polishing metal surfaces, a rotatable polishingwheel, a work support,

. means for pivoting saidwork support intermediate its ends, means onsaid work support on one side of the pivot means to engage the work forbacking up the latter and to control the feed thereof,counter-balancingmeans on the work support on the other side of saidpivot means to neutralise gravitational effect-on the work-engagingmeans, a diaphragm, a boss attached to said work support resting on saiddiaa phragm and out o! frictional sliding contact with other parts,controlled pressure means :tor moving said diaphragm to urge the workthrough the work-engaging means of said work support toward saidpolishing wheel, and separate means at the counter-balancing end of thework support to rock the latter away from the work.

' 37, In a machine' for polishing metal surfaces.

va rotatable polishing wheel, a work support,

lmeans for pivoting said work support intermediate its ends, means onsaid work support on one side or the pivot means to engage the work forbacking up the .latter and to control the feed thereof,counter-balancing means on the carriagev on the other side of said pivotmeans to neutralize gravitational eil'ect on the workengaging means, adiaphragm, a boss attached to said carriage resting on said diaphragmand out oi' trictional sliding contact with other parts, l

' andan air pressure chamber for operating said diaphragm,-`and means toadjust the counterbalancing means.

38. In a machine for polishing metal surfaces. a rotatable polishingwheel, a work support, means for pivoting said work support intermediateits ends, means on said work support on one side of the pivot means toengage the work :for backing up the latter'and to control the reedthereof, counter-balancing means on the work support on the other sideoisaid pivot means to neutralise gravitational elect on the work-engagingmeans, a diaphragm. a boss -attached to said .work support resting onsaid diaphragm and out of frictional sliding contact with other parts,andan air pressure chamber for operating said diaphragm, and means tomove the work-engaging means on said work support 'away from, thepolishing wheel.

sa. 1n a machine for ponsmng menu surfaces.'

portion `attached ito said work 4,support'andanV vairgpressure chamber.ioroperating said disphragm, and means to move the work-engaging meansin said work support away from'the polishing wheel and at the sametimeautomatically relieve the diaphragm pressure thereon.

40. In a machine for polishing reotilineal metal surfaces, a rotatablepolishing wheel having a peripheral work engaging surface oi a denitecharacter which is maintained during the polishing operation, a rockablework-support arranged Vbeneath said wheel, meansior counter-balancingsaid work support and movable to a plurality of adjusted positionsrelative to said support, a controlled iluid pressure -device operableby uid at predetermined pressure values for transmitting a predeterminedpressure value corresponding to the intensity ofl the applied huid, andmeans-responsivel with said pressure device and actuated thereby to rocksaid work support toward the polishing wheel and lift the work upwardiyinto engagement therewith.

41., In a machine for polishing metal surfaces, a rotatable polishingwheel, a work support, means for pivoting said work support intermediateof its ends, means on said work support on one side of the pivotlmeansto engage the work for backing up the latter, a diaphragm, andcontrolled i'iuid pressure means for movingy said diaphragm to urge thework through the work engaging means of said work support toward saidpolishing wheel.

42.- In a machine for polishing metal surfaces, a rotatable polishingwheel, a work support, means for pivoting said work support intermediateof its ends, means on said work support on one side oi the pivot meansto engage the work .for backing up the latter, a diaphragm, a bossatached to said work support resting on said dia-.- phragm and out ofirictional contact with the other parts, and a iluid pressure chamberfor operating vsaid diaphragm to urge the work through the work engagingmeans of said work support toward said polishing wheel.

43. In a machine flor polishing metal surfaces, a rotatable polishingwheel, a work support, means for pivoting said work support intermediateof its ends, a rotatable member on said worksupport on one side of thepivot means to engage the workfor backing up the latter, a diaphragm, aboss attached to said workv supportresting on said diaphragm and out offrictionaf'sliding contact with the other parts, and a contrwolled uid'1 pressure means for operating said diaphragm to urge the work throughthe work engaging means of said worksupport toward said polishing wheel.

`4i.'In a machine for polishing metal surfaces,

a rotatable polishing wheel, a work support. means for pivoting saidwork support intermediate of its ends, means on said work support on oneside of the pivot means to engage thel work for backing upthe latter, adiaphragm, aA boss attached to said work Support resting on saiddiaphragnr and out of frictional sliding contact with the other parts, ailuid pressure chamber for operating said diaphragm to urge the workthrough the work' engagingmeans of said work support toward saidpolishing wheel, and means to move the work engaging means on said worksupport away from the polishing wheel and at the samel timeautomatically. relieve the diaphragm pressure' thereon.

Y DAVID E. MULHOLLAND.

